How do I use Greek letters in fprintf ? Since fprintf uses \ in its argument, I cant write Greek letters in it. Thanks

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ebrahimina 2017-7-1

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评论： DGM 2023-8-5

 fprintf(' \lambda %g\t',10)
 Warning: Escape sequence 'l' is not valid.See 'help sprint' for valid escape sequences.

回答（4 个）

Arpan Bhowmik 2018-3-30

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Try escaping the escape character:

fprintf('\\lambda %g\t',10)

I know this works to get Greek characters in sprintf.

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Syed Ali 2022-5-9

Thanks Arpan, solved my problem

Samuel 2022-7-27

Thanks!!

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Walter Roberson 2017-7-1

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fprintf('\x03bb %g\t', 10)

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Jerry Malone 2023-8-4

移动：Voss 2023-8-4

Just curious, why does this work?

>> fprintf('(RLS) \x03bb: [%4.6E, %4.6E, %4.6E]\n',lambda);

(RLS) λ: [9.999000E-01, 9.999800E-01, 9.999000E-01]

But this does not?

>> disp(sprintf('(RLS) \\lambda: [%4.6E, %4.6E, %4.6E]\n',lambda))

(RLS) \lambda: [9.999000E-01, 9.999800E-01, 9.999000E-01]

Nor does this:

>> disp(sprintf('(RLS) \lambda: [%4.6E, %4.6E, %4.6E]\n',lambda))

Warning: Escaped character '\l' is not valid. See 'doc sprintf' for supported special

characters.

(RLS)

Walter Roberson 2023-8-5

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@Jerry Malone

The character vector \lambda is coding for TeX or LaTeX, and is completely unknown to sprintf() or fprintf() or compose() or to the MATLAB command window generally.

\x03bb is using the documented fprintf() / sprintf() facility to encode character positions in the current font (which is not necessarily Unicode)

You might also have seen something like

syms lambda
'(RLS)', disp(lambda), '[9.999000E-01, 9.999800E-01, 9.999000E-01]'
ans = '(RLS)'
λ
ans = '[9.999000E-01, 9.999800E-01, 9.999000E-01]'

This only works with the Symbolic Toolbox when it is being displayed in LiveScript mode or being displayed in MATLAB Online or MATLAB Answers. And it is difficult to insert into the middle of a string.

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Image Analyst 2017-7-3

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I can get plenty of Greek symbols in the command window doing this:

>> str = sprintf('%c ', 900:1000)

Just pick the right number.

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Image Analyst 2020-4-15

I'd call the Mathworks on that, because for me in R2020a, I do see lots of Greek symbols:

If you don't see what I do above, then maybe there is some kind of regionalization of the operating system that is not allowing you to see them. The Mathworks should be able to talk you through it. Come back here and let us know how they fixed it for you.

DGM 2023-8-5

Works for me in R2009b. Maybe that's more of a system problem than the version?

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Spencer Cochran 2019-11-20

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编辑：Spencer Cochran 2019-11-20

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Leverage the Unicode representation of the Greek Letter.

'lambda' in Unicode is the Hex number: '039B' (You can find Unicode lists online).

Convert from the Hex Unicode character string -> to decimal -> to char -> concatenate with other character strings.

Lambda = char(hex2dec('039B')); 
Omega = char(937); 
disp(['disp Function:    ' Lambda '  |  ' Omega]);                                                                 
fprintf(['fprintf Function: ' Lambda '  |  ' Omega '\n']);

This code gives:

disp Function: Λ | Ω

fprintf Function: Λ | Ω

There may be more elegant ways of doing this, but it works for me!

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Walter Roberson 2019-11-22

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This is the same basic approach as I suggested above where I suggested

fprintf('\x03bb %g\t', 10)

The \x03bb codes for U+03BB which is λ (lower-case Lambda).

The difficulty with this turned out to be that the person asking the question was using an older version of Windows that did not have the right font or code page activated. It took Microsoft a long time to catch up on Unicode (if they even have caught up yet.)

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